"We have taken steps to strengthen the security of our systems, and customers can feel confident using payment cards at Hyatt hotels worldwide," the company posted on a website for updates about the hack.

A spokeswoman for the company said, "the malware has been identified on computers that operate the payment processing systems for Hyatt-managed locations, which is a subset of the total Hyatt properties."

Customers in the U.S. and Canada can contact Hyatt with questions at 1-877-218-3036 or +1-814-201-3665 from all other countries.